A Tip on changing 3 phase AC motor rotation

td456

8 n4 _$ A) E! j. E8 l! ^3 }We all know that if you want to change the rotation of a three  phase AC motor.
0 e6 F5 q3 I% {# r0 sJust swap any of the two phase leads.
$ H$ g) h3 X3 _* b1 L* i  DBut for VFD application you need to do the swap after the inverter.
& |. B- W4 @6 d  t3 B$ m/ K9 D( pIf you swap the leads before the inverter, it will not work.

nw123

go go go

MrElectrician

Yes, Good point.
0 T! T$ R8 d/ g! t$ n" u, T( P
As the principal of the VFD works, bascially from AC to DC, then DC to AC.
' i2 ?2 Y  h! r; h4 u( q& s
) |6 X+ \; L4 C) R. oThe phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.

4 N& h& `, ]8 N) _4 b# Q; H9 O: CThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.

jiodiangong

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